Erosion :)
Flood waters cause rivers to scour out their beds, leaving a enter channel.
erosion. and due to that erosion we get sedimentary rock.
An example of weathering abrasion is when rocks and pebbles carried by a river rub against the riverbed, causing both the rocks and the riverbed to wear down over time due to the abrasive action of the particles. This process results in the smoothing and rounding of the rocks and the deepening of the riverbed.
When rocks settle down at the bottom of a river, the process is called sedimentation. This occurs when the water's flow slows, allowing particles and sediments, including rocks, to accumulate on the riverbed. Over time, these sediments can build up and form layers, contributing to the river's geological features.
Attrition in a river occurs when rocks and sediment carried by the water collide with each other and the riverbed, leading to the gradual wear and erosion of these materials. As the water flows, the force of the current causes particles to break apart and smooth out, reducing their size and sharp edges. This process contributes to the river's sediment transport and alters the riverbed's shape over time. Additionally, factors such as water velocity, sediment type, and flow turbulence can influence the rate of attrition.
The abraision of rocks can happen when one rock hits another, when river rocks tumble in the riverbed by fast moving water, by blowing sand particles hitting the rock, and when rocks grind against each other.
Evolution
The three ways of river erosion are hydraulic action (force of water on the river banks), abrasion (wearing down of the riverbed by sediment), and attrition (erosion caused by rocks and sediment carried by the river rubbing against each other).
Riverbeds are typically made of a combination of soil, sediment, rocks, and other natural materials that have been eroded and transported by the flowing water. The composition of a riverbed can vary depending on factors such as the type of rock in the area, the speed of the water, and the amount of sediment carried by the river.
A rock is a mixture of compounds.
Abrasion. (~the process of scraping or wearing away)
The two erosional processes found in rivers are mainly attrition and vertical hydraulic action. Attrition is where the moving river water dislodges materials like rocks on the sides of the river and carries them with the flow. Vertical hydraulic action is where moving water removes materials from the riverbed and carry it with the flow. This causes less resistant rocks to be eroded and thus forming a plunge pool, or waterfall.